Police are now trying to determine the identities of the people involved in the attack.

An investigation has also been launched into the alleged rape of the 3-year-old, reports note. The girl's mother reportedly noticed that something was amiss when she arrived home Sunday evening. Castro, who works on a farm where the child was staying with her grandparents at the time, was accused of sexually abusing the girl.

The Institute of Forensic Medicine examined the girl and determined she was not raped, Spanish-language news agency EFE reports. However, authorities have not released their final report.